/* ============================================================
    CSS CUSTOM PROPERTIES — Dark / Light theme tokens
    ============================================================ */
:root {
    --bg: #fafafa;
    --bg2: #f5f5f5;
    --surface: #ffffff;
    --surface2: #ebebeb;
    --accent: #171717;
    --accent2: #0070f3;
    --accent3: #7928ca;
    --text: #171717;
    --text-muted: #4d4d4d;
    --border: #ebebeb;
    --glow: 0px 1px 2px rgba(0,0,0,0.05), 0px 2px 4px rgba(0,0,0,0.05);
    --glow2: 0px 2px 4px rgba(0,0,0,0.06), 0px 8px 16px -8px rgba(0,0,0,0.06);
    --nav-h: 64px;
    --radius-card: 8px;
    --transition: 0.2s ease;
}

[data-theme="dark"] {
    --bg: #0a0a0a;
    --bg2: #111111;
    --surface: #000000;
    --surface2: #222222;
    --accent: #ffffff;
    --accent2: #0070f3;
    --accent3: #a855f7;
    --text: #ffffff;
    --text-muted: #888888;
    --border: #333333;
    --glow: 0px 1px 2px rgba(0,0,0,0.4);
    --glow2: 0px 2px 8px rgba(0,0,0,0.4);
}

/* ============================================================
       RESET & BASE
       ============================================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-feature-settings: "ss01", "ss02";
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    transition: background 0.4s, color 0.4s;
}

::selection {
    background: var(--accent);
    color: var(--bg);
}

/* ============================================================
       ANIMATED PARTICLE CANVAS — fixed background layer
       ============================================================ */
#bg-canvas {
    display: none;
}

/* ============================================================
       NAVIGATION BAR — identical to site-wide nav
       ============================================================ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-h);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.4s;
}

[data-theme="dark"] nav {
    background: rgba(10, 10, 10, 0.8);
}

/* Logo */
.nav-logo {
    font-family: 'Inter', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -0.5px;
    flex-shrink: 0;
}

.nav-logo span {
    color: var(--text-muted);
}

/* Desktop links */
.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 100px;
    transition: background-color 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
    background-color: var(--bg2);
}

/* Right-side controls */
.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme toggle */
.theme-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    color: var(--text);
}

.theme-btn:hover {
    border-color: var(--accent);
    box-shadow: var(--glow);
}

/* Hamburger (mobile) */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 5px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    display: block;
    transition: all 0.2s;
}

/* Mobile drawer */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 5%;
    z-index: 99;
    flex-direction: column;
    gap: 1.2rem;
}

.mobile-menu.open {
    display: flex;
}

.mobile-menu a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: color 0.2s;
}

.mobile-menu a:hover {
    color: var(--accent);
}

/* ============================================================
       PAGE HERO
       ============================================================ */
.page-hero {
    padding-top: calc(var(--nav-h) + 5rem);
    padding-bottom: 3rem;
    padding-left: 5%;
    padding-right: 5%;
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.page-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    letter-spacing: -0.2px;
    text-transform: uppercase;
    color: var(--accent2);
    margin-bottom: 1rem;
}

.page-hero h1 {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 600;
    letter-spacing: -2px;
    line-height: 1.05;
    margin-bottom: 1.2rem;
    color: var(--text);
}

.page-hero h1 em {
    font-style: normal;
    color: var(--accent3);
}

.page-hero p {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 580px;
}

/* Staggered fade-up animation for hero children */
.page-hero>* {
    animation: fadeUp 0.75s ease both;
}

.page-hero>*:nth-child(1) {
    animation-delay: 0.05s;
}

.page-hero>*:nth-child(2) {
    animation-delay: 0.18s;
}

.page-hero>*:nth-child(3) {
    animation-delay: 0.32s;
}

/* ============================================================
       PROJECT GRID
       ============================================================ */
.projects-section {
    padding: 0 5% 7rem;
    position: relative;
    z-index: 1;
}

.projects-grid {
    display: grid;
    /* Responsive: 1 col → 2 col → 3 col */
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.75rem;
}

/* ============================================================
       PROJECT CARD
       ============================================================ */
.project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
}

/* Lift + glow on hover */
.project-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: var(--glow2);
}

/* Visible state (triggered by JS observer) */
.project-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease,
        box-shadow 0.2s ease, border-color 0.2s ease;
}

.project-card.visible:hover {
    transform: translateY(-2px);
}

/* ---- Thumbnail ---- */
.card-thumb {
    position: relative;
    overflow: hidden;
    height: 200px;
    flex-shrink: 0;
}

.card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s, filter 0.3s;
    filter: saturate(0.85);
}

.project-card:hover .card-thumb img {
    transform: scale(1.04);
    filter: saturate(1);
}

/* Gradient overlay on thumbnail */
.card-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 40%, rgba(0, 0, 0, 0.4) 100%);
    transition: opacity 0.3s;
}

/* ---- Card body ---- */
.card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 0.75rem;
}

.card-title {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    line-height: 1.25;
    color: var(--text);
}

.card-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
    flex: 1;
}

/* ---- Card footer ---- */
.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem 1.5rem;
    gap: 1rem;
}

.card-stats {
    display: flex;
    gap: 1rem;
}

.stat-pill {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.stat-pill svg {
    opacity: 0.6;
}

/* ---- Download Button ---- */
.btn-download {
    position: relative;
    overflow: hidden;
    padding: 0px 16px;
    height: 32px;
    border-radius: 100px;
    background: var(--accent);
    color: var(--bg);
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 13px;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    transition: all 0.2s;
    flex-shrink: 0;
}

.btn-download:hover {
    transform: translateY(-1px);
    box-shadow: var(--glow);
    opacity: 0.9;
}

.btn-download:active {
    transform: translateY(0);
}

/* ---- Downloading state ---- */
.btn-download.downloading {
    background: var(--bg2);
    color: var(--accent2);
    pointer-events: none;
    border: 1px solid var(--border);
}

.btn-download.done {
    background: var(--accent2);
    color: #ffffff;
    pointer-events: none;
}

/* Progress bar inside button */
.btn-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--accent2);
    width: 0;
    border-radius: 0 0 8px 8px;
    transition: width 0.04s linear;
}

/* ============================================================
       EMPTY STATE (shown when filter yields 0 results)
       ============================================================ */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 5rem 2rem;
    color: var(--text-muted);
    gap: 1rem;
}

.empty-state svg {
    opacity: 0.25;
}

.empty-state h3 {
    font-family: 'Inter', sans-serif;
    font-size: 1.3rem;
    color: var(--text);
    font-weight: 600;
}

.empty-state p {
    font-size: 0.9rem;
    max-width: 320px;
}

/* ============================================================
       TOAST NOTIFICATION
       ============================================================ */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    pointer-events: none;
}

.toast {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.85rem 1.2rem;
    font-size: 0.85rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    backdrop-filter: blur(12px);
    animation: toastIn 0.35s ease, toastOut 0.35s 2.6s ease forwards;
    box-shadow: var(--glow2);
    max-width: 300px;
}

.toast span {
    color: var(--accent2);
    font-family: 'JetBrains Mono', monospace;
}

/* ============================================================
       CTA STRIP
       ============================================================ */
.cta-strip {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
    margin: 0 5% 7rem;
    position: relative;
    z-index: 1;
    box-shadow: var(--glow2);
}

.cta-strip h3 {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    color: var(--text);
}

.cta-strip p {
    color: var(--text-muted);
    margin-top: 0.4rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.btn-primary-lg {
    padding: 0px 24px;
    height: 48px;
    border-radius: 100px;
    background: var(--accent);
    color: var(--bg);
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 16px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
    white-space: nowrap;
}

.btn-primary-lg:hover {
    transform: translateY(-1px);
    box-shadow: var(--glow);
    opacity: 0.9;
}

/* ============================================================
       FOOTER
       ============================================================ */
footer {
    padding: 3rem 5%;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    position: relative;
    z-index: 1;
    background: var(--surface);
}

footer span {
    color: var(--accent2);
}

/* ============================================================
       KEYFRAME ANIMATIONS
       ============================================================ */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(28px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastOut {
    to {
        opacity: 0;
        transform: translateX(20px);
    }
}

/* ============================================================
       SCROLL REVEAL helper class
       ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(36px);
    transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
       RESPONSIVE BREAKPOINTS
       ============================================================ */
@media (max-width: 900px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }
}

@media (max-width: 768px) {

    /* Hide desktop nav, show hamburger */
    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .page-hero {
        padding-top: calc(var(--nav-h) + 3rem);
    }

    .page-hero h1 {
        letter-spacing: -1px;
    }

    .cta-strip {
        flex-direction: column;
        text-align: center;
        padding: 2.5rem 1.5rem;
    }

    .cta-strip>div {
        order: 1;
    }

    .btn-primary-lg {
        order: 2;
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 500px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}